Direnza 2.25 stainless catback exhaust system for bmw 3 series e90 320d n47 manufactured from highest quality t304 grade stainless steel. We recommend all exhaust components are fitted by a qualified mechanic to ensure the correct fitment. If you wish to return your item(s) to us please do as followsCall our customer service team and let them know you wish to return your item(s).